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TitleCoastal to offshore submarine channel sediment transport system: Savary Island, British Columbia, Canada
AuthorBarrie, J VORCID logo; Conway, K W
SourceGeo-Marine Letters vol. 39, 6, 2019 p. 435-446,
Alt SeriesNatural Resources Canada, Contribution Series 20200209
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS92F/09; 92F/10; 92F/15; 92F/16
AreaSavary Island
Lat/Long WENS-124.9000 -124.7667 49.9833 49.9167
Subjectsmarine geology; Nature and Environment; Science and Technology; sedimentology; channel deposits; bathymetry; seismic data; marine sediment cores; cores; sediment transport; postglacial deposits; Quaternary
Illustrationslocation maps; bathymetric profiles; images; seismic reflection profiles; schematic diagrams; tables; photographs
Released2019 11 06
AbstractMultibeam bathymetry, coupled with seismic reflection profiles and sediment cores, was collected to understand the sediment process mechanisms for active onshore-offshore sediment transfer system from coastal erosion to nearshore transfer of sediment into a submarine channel and fan system. Savary Island in the northern Salish Sea of British Columbia, Canada, emerged immediately after deglaciation and became exposed to winter storms that began a continual modification of the island. Subsequent to coastal erosion, sediments are moved from the south side of the island, by strong tidal currents and longshore drift, to the island's north side. The mobilized sands are then entrained into and swept down submarine channels during gravity flows, likely a response to enhanced hydrodynamic tidal flow. Downslope progradation within the channels is primarily a result of downslope migrating submarine dunes that transfer sand to small submarine fans. Further transport beyond the channels into the deeper basin occurs via turbidity flows that have been active throughout the late Holocene. The prospect for Savary Island is grim, as this sediment transfer system will likely continue until the island disappears altogether.

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